If you have SUs, check to make sure the floats in the float bowls are correctly adjusted--- I just took a fun trip around the puget sound and had to stop every half-hour to bend and tinker with the darn float in carb #1. But ALL your cars have this problem? You're not getting your gas at 7-11, are you? Try getting the fancy stuff from a major gas distributor and see what goes on. You getting water in the gas? Try dumping a bottle of 99% (100% if you can find it) isopropyl alchohol in the tank on your next fillup. My friend swears by it-- Says it bonds with water and burns it out of the tank. 99% is available at Safeway. They have gas, too, but that's not been tested by me. My cars are so bitchy about the grade of gas I use that it's readily apparent if I use anything other than what they're used to: Union 76 or Shell premium. Have you thought about a hydrogen conversion...?
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